Brewing by-products as a source of natural antioxidants for food preservation

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hdl:2117/367792
Document typeArticle
Defense date2021-09-23
Rights accessOpen Access
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Abstract
Brewer’s spent grain (BSG) and brewer’s spent hops (BSH) are the major solid by-products of the brewing industry. The present work evaluated their potential as an alternative source of natural antioxidants. The efficacy of different solvents (MilliQ water, 0.75% NaOH, 50% MeOH, 50% MeOH + 0.3% HCl and 50% Acetone) for extracting polyphenols of these by-products was firstly evaluated, with NaOH showing the best results. The extraction conditions were optimized using the response surface methodology, and were determined to be 1.45% NaOH and 80 °C. BSG extracts showed the highest total polyphenol content (24.84–38.83 µmol GAE/g), whereas the BSH showed the lowest value (24.84 ± 1.55 µmol GAE/g). In general, BSG extracts presented significantly higher antioxidant capacity (ABTS, ORAC). Ferulic acid was the main polyphenol in all BSG extracts (156.55–290.88 mg/100 g), whereas in BSH, this compound was not detected. The addition of 10% BSG extract in o/w emulsions (stored 14 days) showed a reduction in the formation of primary oxidation products of 97%. In the emulsions covered with polylactic acid active films (1% BSG), this reduction corresponded to 35%. Hence, this study demonstrates the potential of these by-products as natural antioxidant sources for protecting food systems against oxidation.
CitationCodina-Torrella, I.; Rodero, L.; Almajano, M.P. Brewing by-products as a source of natural antioxidants for food preservation. "Antioxidants", 23 Setembre 2021, vol. 10, núm. 10, p. 1-13.
ISSN2076-3921
Publisher versionhttps://www.mdpi.com/2076-3921/10/10/1512/htm
Collections
- ADBD - Anàlisi de Dades Complexes per a les Decisions Empresarials - Articles de revista [112]
- Departament d'Enginyeria Química - Articles de revista [2.116]
- Departament d'Enginyeria Agroalimentària i Biotecnologia - Articles de revista [1.023]
- CRESCA - Centre de Recerca en Seguretat i Control Alimentari - Articles de revista [41]
- Departament d'Estadística i Investigació Operativa - Articles de revista [683]
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